engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Power Systems Transmission and Distribution Overhead Insulators
Which of the following requirements or properties is NOT essential for line insulators?
1
They should be porous
2
They must have high ratio of puncture strength to flash over voltage.
3
Dielectric strength must be very high.
4
They must be free from internal impurities.